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Blackfin: includecheck fix: mach-bf548, ezkit.c
[linux-2.6/kvm.git] / net / mac80211 / mlme.c
blob8d26e9bf896448167f9f2af8b8a9aa9354d85129
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37 * beacon loss detection timeout
38 * XXX: should depend on beacon interval
39 */
40 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
41 /*
42 * Time the connection can be idle before we probe
43 * it to see if we can still talk to the AP.
44 */
45 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
46 /*
47 * Time we wait for a probe response after sending
48 * a probe request because of beacon loss or for
49 * checking the connection still works.
50 */
51 #define IEEE80211_PROBE_WAIT (HZ / 2)
52
53 #define TMR_RUNNING_TIMER 0
54 #define TMR_RUNNING_CHANSW 1
55
56 /*
57 * All cfg80211 functions have to be called outside a locked
58 * section so that they can acquire a lock themselves... This
59 * is much simpler than queuing up things in cfg80211, but we
60 * do need some indirection for that here.
61 */
62 enum rx_mgmt_action {
63 /* no action required */
64 RX_MGMT_NONE,
65
66 /* caller must call cfg80211_send_rx_auth() */
67 RX_MGMT_CFG80211_AUTH,
68
69 /* caller must call cfg80211_send_rx_assoc() */
70 RX_MGMT_CFG80211_ASSOC,
71
72 /* caller must call cfg80211_send_deauth() */
73 RX_MGMT_CFG80211_DEAUTH,
74
75 /* caller must call cfg80211_send_disassoc() */
76 RX_MGMT_CFG80211_DISASSOC,
77
78 /* caller must call cfg80211_auth_timeout() & free work */
79 RX_MGMT_CFG80211_AUTH_TO,
80
81 /* caller must call cfg80211_assoc_timeout() & free work */
82 RX_MGMT_CFG80211_ASSOC_TO,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92 * We can have multiple work items (and connection probing)
93 * scheduling this timer, but we need to take care to only
94 * reschedule it when it should fire _earlier_ than it was
95 * asked for before, or if it's not pending right now. This
96 * function ensures that. Note that it then is required to
97 * run this function for all timeouts after the first one
98 * has happened -- the work that runs from this timer will
99 * do that.
100 */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102 unsigned long timeout)
103 {
104 ASSERT_MGD_MTX(ifmgd);
105
106 if (!timer_pending(&ifmgd->timer) ||
107 time_before(timeout, ifmgd->timer.expires))
108 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114 return;
115
116 mod_timer(&sdata->u.mgd.bcn_mon_timer,
117 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122 return (1 << ecw) - 1;
123 }
124
125 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
126 struct ieee80211_supported_band *sband,
127 u32 *rates)
128 {
129 int i, j, count;
130 *rates = 0;
131 count = 0;
132 for (i = 0; i < bss->supp_rates_len; i++) {
133 int rate = (bss->supp_rates[i] & 0x7F) * 5;
134
135 for (j = 0; j < sband->n_bitrates; j++)
136 if (sband->bitrates[j].bitrate == rate) {
137 *rates |= BIT(j);
138 count++;
139 break;
140 }
141 }
142
143 return count;
144 }
145
146 /*
147 * ieee80211_enable_ht should be called only after the operating band
148 * has been determined as ht configuration depends on the hw's
149 * HT abilities for a specific band.
150 */
151 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
152 struct ieee80211_ht_info *hti,
153 const u8 *bssid, u16 ap_ht_cap_flags)
154 {
155 struct ieee80211_local *local = sdata->local;
156 struct ieee80211_supported_band *sband;
157 struct sta_info *sta;
158 u32 changed = 0;
159 u16 ht_opmode;
160 bool enable_ht = true, ht_changed;
161 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
162
163 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
164
165 /* HT is not supported */
166 if (!sband->ht_cap.ht_supported)
167 enable_ht = false;
168
169 /* check that channel matches the right operating channel */
170 if (local->hw.conf.channel->center_freq !=
171 ieee80211_channel_to_frequency(hti->control_chan))
172 enable_ht = false;
173
174 if (enable_ht) {
175 channel_type = NL80211_CHAN_HT20;
176
177 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
178 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
179 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
180 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
181 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
182 if (!(local->hw.conf.channel->flags &
183 IEEE80211_CHAN_NO_HT40PLUS))
184 channel_type = NL80211_CHAN_HT40PLUS;
185 break;
186 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
187 if (!(local->hw.conf.channel->flags &
188 IEEE80211_CHAN_NO_HT40MINUS))
189 channel_type = NL80211_CHAN_HT40MINUS;
190 break;
191 }
192 }
193 }
194
195 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
196 channel_type != local->hw.conf.channel_type;
197
198 local->oper_channel_type = channel_type;
199
200 if (ht_changed) {
201 /* channel_type change automatically detected */
202 ieee80211_hw_config(local, 0);
203
204 rcu_read_lock();
205 sta = sta_info_get(local, bssid);
206 if (sta)
207 rate_control_rate_update(local, sband, sta,
208 IEEE80211_RC_HT_CHANGED);
209 rcu_read_unlock();
210 }
211
212 /* disable HT */
213 if (!enable_ht)
214 return 0;
215
216 ht_opmode = le16_to_cpu(hti->operation_mode);
217
218 /* if bss configuration changed store the new one */
219 if (!sdata->ht_opmode_valid ||
220 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
221 changed |= BSS_CHANGED_HT;
222 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
223 sdata->ht_opmode_valid = true;
224 }
225
226 return changed;
227 }
228
229 /* frame sending functions */
230
231 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
232 struct ieee80211_mgd_work *wk)
233 {
234 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
235 struct ieee80211_local *local = sdata->local;
236 struct sk_buff *skb;
237 struct ieee80211_mgmt *mgmt;
238 u8 *pos;
239 const u8 *ies, *ht_ie;
240 int i, len, count, rates_len, supp_rates_len;
241 u16 capab;
242 int wmm = 0;
243 struct ieee80211_supported_band *sband;
244 u32 rates = 0;
245
246 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247 sizeof(*mgmt) + 200 + wk->ie_len +
248 wk->ssid_len);
249 if (!skb) {
250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251 "frame\n", sdata->dev->name);
252 return;
253 }
254 skb_reserve(skb, local->hw.extra_tx_headroom);
255
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258 capab = ifmgd->capab;
259
260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265 }
266
267 if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
268 capab |= WLAN_CAPABILITY_PRIVACY;
269 if (wk->bss->wmm_used)
270 wmm = 1;
271
272 /* get all rates supported by the device and the AP as
273 * some APs don't like getting a superset of their rates
274 * in the association request (e.g. D-Link DAP 1353 in
275 * b-only mode) */
276 rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
277
278 if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
279 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
280 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
281
282 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
283 memset(mgmt, 0, 24);
284 memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
285 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
286 memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
287
288 if (!is_zero_ether_addr(wk->prev_bssid)) {
289 skb_put(skb, 10);
290 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
291 IEEE80211_STYPE_REASSOC_REQ);
292 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
293 mgmt->u.reassoc_req.listen_interval =
294 cpu_to_le16(local->hw.conf.listen_interval);
295 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
296 ETH_ALEN);
297 } else {
298 skb_put(skb, 4);
299 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
300 IEEE80211_STYPE_ASSOC_REQ);
301 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
302 mgmt->u.assoc_req.listen_interval =
303 cpu_to_le16(local->hw.conf.listen_interval);
304 }
305
306 /* SSID */
307 ies = pos = skb_put(skb, 2 + wk->ssid_len);
308 *pos++ = WLAN_EID_SSID;
309 *pos++ = wk->ssid_len;
310 memcpy(pos, wk->ssid, wk->ssid_len);
311
312 /* add all rates which were marked to be used above */
313 supp_rates_len = rates_len;
314 if (supp_rates_len > 8)
315 supp_rates_len = 8;
316
317 len = sband->n_bitrates;
318 pos = skb_put(skb, supp_rates_len + 2);
319 *pos++ = WLAN_EID_SUPP_RATES;
320 *pos++ = supp_rates_len;
321
322 count = 0;
323 for (i = 0; i < sband->n_bitrates; i++) {
324 if (BIT(i) & rates) {
325 int rate = sband->bitrates[i].bitrate;
326 *pos++ = (u8) (rate / 5);
327 if (++count == 8)
328 break;
329 }
330 }
331
332 if (rates_len > count) {
333 pos = skb_put(skb, rates_len - count + 2);
334 *pos++ = WLAN_EID_EXT_SUPP_RATES;
335 *pos++ = rates_len - count;
336
337 for (i++; i < sband->n_bitrates; i++) {
338 if (BIT(i) & rates) {
339 int rate = sband->bitrates[i].bitrate;
340 *pos++ = (u8) (rate / 5);
341 }
342 }
343 }
344
345 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
346 /* 1. power capabilities */
347 pos = skb_put(skb, 4);
348 *pos++ = WLAN_EID_PWR_CAPABILITY;
349 *pos++ = 2;
350 *pos++ = 0; /* min tx power */
351 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
352
353 /* 2. supported channels */
354 /* TODO: get this in reg domain format */
355 pos = skb_put(skb, 2 * sband->n_channels + 2);
356 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
357 *pos++ = 2 * sband->n_channels;
358 for (i = 0; i < sband->n_channels; i++) {
359 *pos++ = ieee80211_frequency_to_channel(
360 sband->channels[i].center_freq);
361 *pos++ = 1; /* one channel in the subband*/
362 }
363 }
364
365 if (wk->ie_len && wk->ie) {
366 pos = skb_put(skb, wk->ie_len);
367 memcpy(pos, wk->ie, wk->ie_len);
368 }
369
370 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
371 pos = skb_put(skb, 9);
372 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
373 *pos++ = 7; /* len */
374 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
375 *pos++ = 0x50;
376 *pos++ = 0xf2;
377 *pos++ = 2; /* WME */
378 *pos++ = 0; /* WME info */
379 *pos++ = 1; /* WME ver */
380 *pos++ = 0;
381 }
382
383 /* wmm support is a must to HT */
384 /*
385 * IEEE802.11n does not allow TKIP/WEP as pairwise
386 * ciphers in HT mode. We still associate in non-ht
387 * mode (11a/b/g) if any one of these ciphers is
388 * configured as pairwise.
389 */
390 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
391 sband->ht_cap.ht_supported &&
392 (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
393 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
394 (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
395 struct ieee80211_ht_info *ht_info =
396 (struct ieee80211_ht_info *)(ht_ie + 2);
397 u16 cap = sband->ht_cap.cap;
398 __le16 tmp;
399 u32 flags = local->hw.conf.channel->flags;
400
401 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
402 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
403 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
404 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
405 cap &= ~IEEE80211_HT_CAP_SGI_40;
406 }
407 break;
408 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
409 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
410 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
411 cap &= ~IEEE80211_HT_CAP_SGI_40;
412 }
413 break;
414 }
415
416 tmp = cpu_to_le16(cap);
417 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
418 *pos++ = WLAN_EID_HT_CAPABILITY;
419 *pos++ = sizeof(struct ieee80211_ht_cap);
420 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
421 memcpy(pos, &tmp, sizeof(u16));
422 pos += sizeof(u16);
423 /* TODO: needs a define here for << 2 */
424 *pos++ = sband->ht_cap.ampdu_factor |
425 (sband->ht_cap.ampdu_density << 2);
426 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
427 }
428
429 ieee80211_tx_skb(sdata, skb, 0);
430 }
431
432
433 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
434 const u8 *bssid, u16 stype, u16 reason,
435 void *cookie)
436 {
437 struct ieee80211_local *local = sdata->local;
438 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
439 struct sk_buff *skb;
440 struct ieee80211_mgmt *mgmt;
441
442 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
443 if (!skb) {
444 printk(KERN_DEBUG "%s: failed to allocate buffer for "
445 "deauth/disassoc frame\n", sdata->dev->name);
446 return;
447 }
448 skb_reserve(skb, local->hw.extra_tx_headroom);
449
450 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
451 memset(mgmt, 0, 24);
452 memcpy(mgmt->da, bssid, ETH_ALEN);
453 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
454 memcpy(mgmt->bssid, bssid, ETH_ALEN);
455 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
456 skb_put(skb, 2);
457 /* u.deauth.reason_code == u.disassoc.reason_code */
458 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
459
460 if (stype == IEEE80211_STYPE_DEAUTH)
461 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, cookie);
462 else
463 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len, cookie);
464 ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
465 }
466
467 void ieee80211_send_pspoll(struct ieee80211_local *local,
468 struct ieee80211_sub_if_data *sdata)
469 {
470 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
471 struct ieee80211_pspoll *pspoll;
472 struct sk_buff *skb;
473 u16 fc;
474
475 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
476 if (!skb) {
477 printk(KERN_DEBUG "%s: failed to allocate buffer for "
478 "pspoll frame\n", sdata->dev->name);
479 return;
480 }
481 skb_reserve(skb, local->hw.extra_tx_headroom);
482
483 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
484 memset(pspoll, 0, sizeof(*pspoll));
485 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
486 pspoll->frame_control = cpu_to_le16(fc);
487 pspoll->aid = cpu_to_le16(ifmgd->aid);
488
489 /* aid in PS-Poll has its two MSBs each set to 1 */
490 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
491
492 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
493 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
494
495 ieee80211_tx_skb(sdata, skb, 0);
496 }
497
498 void ieee80211_send_nullfunc(struct ieee80211_local *local,
499 struct ieee80211_sub_if_data *sdata,
500 int powersave)
501 {
502 struct sk_buff *skb;
503 struct ieee80211_hdr *nullfunc;
504 __le16 fc;
505
506 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
507 return;
508
509 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
510 if (!skb) {
511 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
512 "frame\n", sdata->dev->name);
513 return;
514 }
515 skb_reserve(skb, local->hw.extra_tx_headroom);
516
517 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
518 memset(nullfunc, 0, 24);
519 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
520 IEEE80211_FCTL_TODS);
521 if (powersave)
522 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
523 nullfunc->frame_control = fc;
524 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
525 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
526 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
527
528 ieee80211_tx_skb(sdata, skb, 0);
529 }
530
531 /* spectrum management related things */
532 static void ieee80211_chswitch_work(struct work_struct *work)
533 {
534 struct ieee80211_sub_if_data *sdata =
535 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
536 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
537
538 if (!netif_running(sdata->dev))
539 return;
540
541 mutex_lock(&ifmgd->mtx);
542 if (!ifmgd->associated)
543 goto out;
544
545 sdata->local->oper_channel = sdata->local->csa_channel;
546 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
547
548 /* XXX: shouldn't really modify cfg80211-owned data! */
549 ifmgd->associated->cbss.channel = sdata->local->oper_channel;
550
551 ieee80211_wake_queues_by_reason(&sdata->local->hw,
552 IEEE80211_QUEUE_STOP_REASON_CSA);
553 out:
554 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
555 mutex_unlock(&ifmgd->mtx);
556 }
557
558 static void ieee80211_chswitch_timer(unsigned long data)
559 {
560 struct ieee80211_sub_if_data *sdata =
561 (struct ieee80211_sub_if_data *) data;
562 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
563
564 if (sdata->local->quiescing) {
565 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
566 return;
567 }
568
569 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
570 }
571
572 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
573 struct ieee80211_channel_sw_ie *sw_elem,
574 struct ieee80211_bss *bss)
575 {
576 struct ieee80211_channel *new_ch;
577 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
578 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
579
580 ASSERT_MGD_MTX(ifmgd);
581
582 if (!ifmgd->associated)
583 return;
584
585 if (sdata->local->scanning)
586 return;
587
588 /* Disregard subsequent beacons if we are already running a timer
589 processing a CSA */
590
591 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
592 return;
593
594 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
595 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
596 return;
597
598 sdata->local->csa_channel = new_ch;
599
600 if (sw_elem->count <= 1) {
601 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
602 } else {
603 ieee80211_stop_queues_by_reason(&sdata->local->hw,
604 IEEE80211_QUEUE_STOP_REASON_CSA);
605 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
606 mod_timer(&ifmgd->chswitch_timer,
607 jiffies +
608 msecs_to_jiffies(sw_elem->count *
609 bss->cbss.beacon_interval));
610 }
611 }
612
613 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
614 u16 capab_info, u8 *pwr_constr_elem,
615 u8 pwr_constr_elem_len)
616 {
617 struct ieee80211_conf *conf = &sdata->local->hw.conf;
618
619 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
620 return;
621
622 /* Power constraint IE length should be 1 octet */
623 if (pwr_constr_elem_len != 1)
624 return;
625
626 if ((*pwr_constr_elem <= conf->channel->max_power) &&
627 (*pwr_constr_elem != sdata->local->power_constr_level)) {
628 sdata->local->power_constr_level = *pwr_constr_elem;
629 ieee80211_hw_config(sdata->local, 0);
630 }
631 }
632
633 /* powersave */
634 static void ieee80211_enable_ps(struct ieee80211_local *local,
635 struct ieee80211_sub_if_data *sdata)
636 {
637 struct ieee80211_conf *conf = &local->hw.conf;
638
639 /*
640 * If we are scanning right now then the parameters will
641 * take effect when scan finishes.
642 */
643 if (local->scanning)
644 return;
645
646 if (conf->dynamic_ps_timeout > 0 &&
647 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
648 mod_timer(&local->dynamic_ps_timer, jiffies +
649 msecs_to_jiffies(conf->dynamic_ps_timeout));
650 } else {
651 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
652 ieee80211_send_nullfunc(local, sdata, 1);
653 conf->flags |= IEEE80211_CONF_PS;
654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
655 }
656 }
657
658 static void ieee80211_change_ps(struct ieee80211_local *local)
659 {
660 struct ieee80211_conf *conf = &local->hw.conf;
661
662 if (local->ps_sdata) {
663 ieee80211_enable_ps(local, local->ps_sdata);
664 } else if (conf->flags & IEEE80211_CONF_PS) {
665 conf->flags &= ~IEEE80211_CONF_PS;
666 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
667 del_timer_sync(&local->dynamic_ps_timer);
668 cancel_work_sync(&local->dynamic_ps_enable_work);
669 }
670 }
671
672 /* need to hold RTNL or interface lock */
673 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
674 {
675 struct ieee80211_sub_if_data *sdata, *found = NULL;
676 int count = 0;
677
678 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
679 local->ps_sdata = NULL;
680 return;
681 }
682
683 list_for_each_entry(sdata, &local->interfaces, list) {
684 if (!netif_running(sdata->dev))
685 continue;
686 if (sdata->vif.type != NL80211_IFTYPE_STATION)
687 continue;
688 found = sdata;
689 count++;
690 }
691
692 if (count == 1 && found->u.mgd.powersave &&
693 found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
694 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
695 IEEE80211_STA_CONNECTION_POLL))) {
696 s32 beaconint_us;
697
698 if (latency < 0)
699 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
700
701 beaconint_us = ieee80211_tu_to_usec(
702 found->vif.bss_conf.beacon_int);
703
704 if (beaconint_us > latency) {
705 local->ps_sdata = NULL;
706 } else {
707 u8 dtimper = found->vif.bss_conf.dtim_period;
708 int maxslp = 1;
709
710 if (dtimper > 1)
711 maxslp = min_t(int, dtimper,
712 latency / beaconint_us);
713
714 local->hw.conf.max_sleep_period = maxslp;
715 local->ps_sdata = found;
716 }
717 } else {
718 local->ps_sdata = NULL;
719 }
720
721 ieee80211_change_ps(local);
722 }
723
724 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
725 {
726 struct ieee80211_local *local =
727 container_of(work, struct ieee80211_local,
728 dynamic_ps_disable_work);
729
730 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
731 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
732 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
733 }
734
735 ieee80211_wake_queues_by_reason(&local->hw,
736 IEEE80211_QUEUE_STOP_REASON_PS);
737 }
738
739 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
740 {
741 struct ieee80211_local *local =
742 container_of(work, struct ieee80211_local,
743 dynamic_ps_enable_work);
744 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
745
746 /* can only happen when PS was just disabled anyway */
747 if (!sdata)
748 return;
749
750 if (local->hw.conf.flags & IEEE80211_CONF_PS)
751 return;
752
753 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
754 ieee80211_send_nullfunc(local, sdata, 1);
755
756 local->hw.conf.flags |= IEEE80211_CONF_PS;
757 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
758 }
759
760 void ieee80211_dynamic_ps_timer(unsigned long data)
761 {
762 struct ieee80211_local *local = (void *) data;
763
764 if (local->quiescing || local->suspended)
765 return;
766
767 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
768 }
769
770 /* MLME */
771 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
772 struct ieee80211_if_managed *ifmgd,
773 u8 *wmm_param, size_t wmm_param_len)
774 {
775 struct ieee80211_tx_queue_params params;
776 size_t left;
777 int count;
778 u8 *pos;
779
780 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
781 return;
782
783 if (!wmm_param)
784 return;
785
786 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
787 return;
788 count = wmm_param[6] & 0x0f;
789 if (count == ifmgd->wmm_last_param_set)
790 return;
791 ifmgd->wmm_last_param_set = count;
792
793 pos = wmm_param + 8;
794 left = wmm_param_len - 8;
795
796 memset(&params, 0, sizeof(params));
797
798 local->wmm_acm = 0;
799 for (; left >= 4; left -= 4, pos += 4) {
800 int aci = (pos[0] >> 5) & 0x03;
801 int acm = (pos[0] >> 4) & 0x01;
802 int queue;
803
804 switch (aci) {
805 case 1: /* AC_BK */
806 queue = 3;
807 if (acm)
808 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
809 break;
810 case 2: /* AC_VI */
811 queue = 1;
812 if (acm)
813 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
814 break;
815 case 3: /* AC_VO */
816 queue = 0;
817 if (acm)
818 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
819 break;
820 case 0: /* AC_BE */
821 default:
822 queue = 2;
823 if (acm)
824 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
825 break;
826 }
827
828 params.aifs = pos[0] & 0x0f;
829 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
830 params.cw_min = ecw2cw(pos[1] & 0x0f);
831 params.txop = get_unaligned_le16(pos + 2);
832 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
833 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
834 "cWmin=%d cWmax=%d txop=%d\n",
835 wiphy_name(local->hw.wiphy), queue, aci, acm,
836 params.aifs, params.cw_min, params.cw_max, params.txop);
837 #endif
838 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
839 printk(KERN_DEBUG "%s: failed to set TX queue "
840 "parameters for queue %d\n",
841 wiphy_name(local->hw.wiphy), queue);
842 }
843 }
844
845 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
846 u16 capab, bool erp_valid, u8 erp)
847 {
848 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
849 u32 changed = 0;
850 bool use_protection;
851 bool use_short_preamble;
852 bool use_short_slot;
853
854 if (erp_valid) {
855 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
856 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
857 } else {
858 use_protection = false;
859 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
860 }
861
862 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
863
864 if (use_protection != bss_conf->use_cts_prot) {
865 bss_conf->use_cts_prot = use_protection;
866 changed |= BSS_CHANGED_ERP_CTS_PROT;
867 }
868
869 if (use_short_preamble != bss_conf->use_short_preamble) {
870 bss_conf->use_short_preamble = use_short_preamble;
871 changed |= BSS_CHANGED_ERP_PREAMBLE;
872 }
873
874 if (use_short_slot != bss_conf->use_short_slot) {
875 bss_conf->use_short_slot = use_short_slot;
876 changed |= BSS_CHANGED_ERP_SLOT;
877 }
878
879 return changed;
880 }
881
882 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
883 struct ieee80211_mgd_work *wk,
884 u32 bss_info_changed)
885 {
886 struct ieee80211_local *local = sdata->local;
887 struct ieee80211_bss *bss = wk->bss;
888
889 bss_info_changed |= BSS_CHANGED_ASSOC;
890 /* set timing information */
891 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
892 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
893 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
894
895 bss_info_changed |= BSS_CHANGED_BEACON_INT;
896 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
897 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
898
899 sdata->u.mgd.associated = bss;
900 sdata->u.mgd.old_associate_work = wk;
901 memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
902
903 /* just to be sure */
904 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
905 IEEE80211_STA_BEACON_POLL);
906
907 ieee80211_led_assoc(local, 1);
908
909 sdata->vif.bss_conf.assoc = 1;
910 /*
911 * For now just always ask the driver to update the basic rateset
912 * when we have associated, we aren't checking whether it actually
913 * changed or not.
914 */
915 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
916
917 /* And the BSSID changed - we're associated now */
918 bss_info_changed |= BSS_CHANGED_BSSID;
919
920 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
921
922 mutex_lock(&local->iflist_mtx);
923 ieee80211_recalc_ps(local, -1);
924 mutex_unlock(&local->iflist_mtx);
925
926 netif_tx_start_all_queues(sdata->dev);
927 netif_carrier_on(sdata->dev);
928 }
929
930 static enum rx_mgmt_action __must_check
931 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
932 struct ieee80211_mgd_work *wk)
933 {
934 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
935 struct ieee80211_local *local = sdata->local;
936
937 wk->tries++;
938 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
939 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
940 sdata->dev->name, wk->bss->cbss.bssid);
941
942 /*
943 * Most likely AP is not in the range so remove the
944 * bss struct for that AP.
945 */
946 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
947
948 /*
949 * We might have a pending scan which had no chance to run yet
950 * due to work needing to be done. Hence, queue the STAs work
951 * again for that.
952 */
953 ieee80211_queue_work(&local->hw, &ifmgd->work);
954 return RX_MGMT_CFG80211_AUTH_TO;
955 }
956
957 printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
958 sdata->dev->name, wk->bss->cbss.bssid,
959 wk->tries);
960
961 /*
962 * Direct probe is sent to broadcast address as some APs
963 * will not answer to direct packet in unassociated state.
964 */
965 ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
966
967 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
968 run_again(ifmgd, wk->timeout);
969
970 return RX_MGMT_NONE;
971 }
972
973
974 static enum rx_mgmt_action __must_check
975 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
976 struct ieee80211_mgd_work *wk)
977 {
978 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
979 struct ieee80211_local *local = sdata->local;
980
981 wk->tries++;
982 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
983 printk(KERN_DEBUG "%s: authentication with AP %pM"
984 " timed out\n",
985 sdata->dev->name, wk->bss->cbss.bssid);
986
987 /*
988 * Most likely AP is not in the range so remove the
989 * bss struct for that AP.
990 */
991 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
992
993 /*
994 * We might have a pending scan which had no chance to run yet
995 * due to work needing to be done. Hence, queue the STAs work
996 * again for that.
997 */
998 ieee80211_queue_work(&local->hw, &ifmgd->work);
999 return RX_MGMT_CFG80211_AUTH_TO;
1000 }
1001
1002 printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1003 sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1004
1005 ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1006 wk->bss->cbss.bssid, NULL, 0, 0);
1007 wk->auth_transaction = 2;
1008
1009 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1010 run_again(ifmgd, wk->timeout);
1011
1012 return RX_MGMT_NONE;
1013 }
1014
1015 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1016 bool deauth)
1017 {
1018 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1019 struct ieee80211_local *local = sdata->local;
1020 struct sta_info *sta;
1021 u32 changed = 0, config_changed = 0;
1022 u8 bssid[ETH_ALEN];
1023
1024 ASSERT_MGD_MTX(ifmgd);
1025
1026 if (WARN_ON(!ifmgd->associated))
1027 return;
1028
1029 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1030
1031 ifmgd->associated = NULL;
1032 memset(ifmgd->bssid, 0, ETH_ALEN);
1033
1034 if (deauth) {
1035 kfree(ifmgd->old_associate_work);
1036 ifmgd->old_associate_work = NULL;
1037 } else {
1038 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1039
1040 wk->state = IEEE80211_MGD_STATE_IDLE;
1041 list_add(&wk->list, &ifmgd->work_list);
1042 }
1043
1044 /*
1045 * we need to commit the associated = NULL change because the
1046 * scan code uses that to determine whether this iface should
1047 * go to/wake up from powersave or not -- and could otherwise
1048 * wake the queues erroneously.
1049 */
1050 smp_mb();
1051
1052 /*
1053 * Thus, we can only afterwards stop the queues -- to account
1054 * for the case where another CPU is finishing a scan at this
1055 * time -- we don't want the scan code to enable queues.
1056 */
1057
1058 netif_tx_stop_all_queues(sdata->dev);
1059 netif_carrier_off(sdata->dev);
1060
1061 rcu_read_lock();
1062 sta = sta_info_get(local, bssid);
1063 if (sta)
1064 ieee80211_sta_tear_down_BA_sessions(sta);
1065 rcu_read_unlock();
1066
1067 changed |= ieee80211_reset_erp_info(sdata);
1068
1069 ieee80211_led_assoc(local, 0);
1070 changed |= BSS_CHANGED_ASSOC;
1071 sdata->vif.bss_conf.assoc = false;
1072
1073 ieee80211_set_wmm_default(sdata);
1074
1075 ieee80211_recalc_idle(local);
1076
1077 /* channel(_type) changes are handled by ieee80211_hw_config */
1078 local->oper_channel_type = NL80211_CHAN_NO_HT;
1079
1080 /* on the next assoc, re-program HT parameters */
1081 sdata->ht_opmode_valid = false;
1082
1083 local->power_constr_level = 0;
1084
1085 del_timer_sync(&local->dynamic_ps_timer);
1086 cancel_work_sync(&local->dynamic_ps_enable_work);
1087
1088 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090 config_changed |= IEEE80211_CONF_CHANGE_PS;
1091 }
1092
1093 ieee80211_hw_config(local, config_changed);
1094
1095 /* And the BSSID changed -- not very interesting here */
1096 changed |= BSS_CHANGED_BSSID;
1097 ieee80211_bss_info_change_notify(sdata, changed);
1098
1099 rcu_read_lock();
1100
1101 sta = sta_info_get(local, bssid);
1102 if (!sta) {
1103 rcu_read_unlock();
1104 return;
1105 }
1106
1107 sta_info_unlink(&sta);
1108
1109 rcu_read_unlock();
1110
1111 sta_info_destroy(sta);
1112 }
1113
1114 static enum rx_mgmt_action __must_check
1115 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1116 struct ieee80211_mgd_work *wk)
1117 {
1118 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1119 struct ieee80211_local *local = sdata->local;
1120
1121 wk->tries++;
1122 if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1123 printk(KERN_DEBUG "%s: association with AP %pM"
1124 " timed out\n",
1125 sdata->dev->name, wk->bss->cbss.bssid);
1126
1127 /*
1128 * Most likely AP is not in the range so remove the
1129 * bss struct for that AP.
1130 */
1131 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1132
1133 /*
1134 * We might have a pending scan which had no chance to run yet
1135 * due to work needing to be done. Hence, queue the STAs work
1136 * again for that.
1137 */
1138 ieee80211_queue_work(&local->hw, &ifmgd->work);
1139 return RX_MGMT_CFG80211_ASSOC_TO;
1140 }
1141
1142 printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1143 sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1144 ieee80211_send_assoc(sdata, wk);
1145
1146 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1147 run_again(ifmgd, wk->timeout);
1148
1149 return RX_MGMT_NONE;
1150 }
1151
1152 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1153 struct ieee80211_hdr *hdr)
1154 {
1155 /*
1156 * We can postpone the mgd.timer whenever receiving unicast frames
1157 * from AP because we know that the connection is working both ways
1158 * at that time. But multicast frames (and hence also beacons) must
1159 * be ignored here, because we need to trigger the timer during
1160 * data idle periods for sending the periodic probe request to the
1161 * AP we're connected to.
1162 */
1163 if (is_multicast_ether_addr(hdr->addr1))
1164 return;
1165
1166 mod_timer(&sdata->u.mgd.conn_mon_timer,
1167 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1168 }
1169
1170 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1171 {
1172 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1173 const u8 *ssid;
1174
1175 ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1176 ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1177 ssid + 2, ssid[1], NULL, 0);
1178
1179 ifmgd->probe_send_count++;
1180 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1181 run_again(ifmgd, ifmgd->probe_timeout);
1182 }
1183
1184 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1185 bool beacon)
1186 {
1187 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1188 bool already = false;
1189
1190 if (!netif_running(sdata->dev))
1191 return;
1192
1193 if (sdata->local->scanning)
1194 return;
1195
1196 mutex_lock(&ifmgd->mtx);
1197
1198 if (!ifmgd->associated)
1199 goto out;
1200
1201 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1202 if (beacon && net_ratelimit())
1203 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1204 "- sending probe request\n", sdata->dev->name);
1205 #endif
1206
1207 /*
1208 * The driver/our work has already reported this event or the
1209 * connection monitoring has kicked in and we have already sent
1210 * a probe request. Or maybe the AP died and the driver keeps
1211 * reporting until we disassociate...
1212 *
1213 * In either case we have to ignore the current call to this
1214 * function (except for setting the correct probe reason bit)
1215 * because otherwise we would reset the timer every time and
1216 * never check whether we received a probe response!
1217 */
1218 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1219 IEEE80211_STA_CONNECTION_POLL))
1220 already = true;
1221
1222 if (beacon)
1223 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1224 else
1225 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1226
1227 if (already)
1228 goto out;
1229
1230 mutex_lock(&sdata->local->iflist_mtx);
1231 ieee80211_recalc_ps(sdata->local, -1);
1232 mutex_unlock(&sdata->local->iflist_mtx);
1233
1234 ifmgd->probe_send_count = 0;
1235 ieee80211_mgd_probe_ap_send(sdata);
1236 out:
1237 mutex_unlock(&ifmgd->mtx);
1238 }
1239
1240 void ieee80211_beacon_loss_work(struct work_struct *work)
1241 {
1242 struct ieee80211_sub_if_data *sdata =
1243 container_of(work, struct ieee80211_sub_if_data,
1244 u.mgd.beacon_loss_work);
1245
1246 ieee80211_mgd_probe_ap(sdata, true);
1247 }
1248
1249 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1250 {
1251 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1252
1253 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1254 }
1255 EXPORT_SYMBOL(ieee80211_beacon_loss);
1256
1257 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1258 struct ieee80211_mgd_work *wk)
1259 {
1260 wk->state = IEEE80211_MGD_STATE_IDLE;
1261 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1262 }
1263
1264
1265 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1266 struct ieee80211_mgd_work *wk,
1267 struct ieee80211_mgmt *mgmt,
1268 size_t len)
1269 {
1270 u8 *pos;
1271 struct ieee802_11_elems elems;
1272
1273 pos = mgmt->u.auth.variable;
1274 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1275 if (!elems.challenge)
1276 return;
1277 ieee80211_send_auth(sdata, 3, wk->auth_alg,
1278 elems.challenge - 2, elems.challenge_len + 2,
1279 wk->bss->cbss.bssid,
1280 wk->key, wk->key_len, wk->key_idx);
1281 wk->auth_transaction = 4;
1282 }
1283
1284 static enum rx_mgmt_action __must_check
1285 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1286 struct ieee80211_mgd_work *wk,
1287 struct ieee80211_mgmt *mgmt, size_t len)
1288 {
1289 u16 auth_alg, auth_transaction, status_code;
1290
1291 if (wk->state != IEEE80211_MGD_STATE_AUTH)
1292 return RX_MGMT_NONE;
1293
1294 if (len < 24 + 6)
1295 return RX_MGMT_NONE;
1296
1297 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1298 return RX_MGMT_NONE;
1299
1300 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1301 return RX_MGMT_NONE;
1302
1303 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1304 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1305 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1306
1307 if (auth_alg != wk->auth_alg ||
1308 auth_transaction != wk->auth_transaction)
1309 return RX_MGMT_NONE;
1310
1311 if (status_code != WLAN_STATUS_SUCCESS) {
1312 list_del(&wk->list);
1313 kfree(wk);
1314 return RX_MGMT_CFG80211_AUTH;
1315 }
1316
1317 switch (wk->auth_alg) {
1318 case WLAN_AUTH_OPEN:
1319 case WLAN_AUTH_LEAP:
1320 case WLAN_AUTH_FT:
1321 ieee80211_auth_completed(sdata, wk);
1322 return RX_MGMT_CFG80211_AUTH;
1323 case WLAN_AUTH_SHARED_KEY:
1324 if (wk->auth_transaction == 4) {
1325 ieee80211_auth_completed(sdata, wk);
1326 return RX_MGMT_CFG80211_AUTH;
1327 } else
1328 ieee80211_auth_challenge(sdata, wk, mgmt, len);
1329 break;
1330 }
1331
1332 return RX_MGMT_NONE;
1333 }
1334
1335
1336 static enum rx_mgmt_action __must_check
1337 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1338 struct ieee80211_mgd_work *wk,
1339 struct ieee80211_mgmt *mgmt, size_t len)
1340 {
1341 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1342 const u8 *bssid = NULL;
1343 u16 reason_code;
1344
1345 if (len < 24 + 2)
1346 return RX_MGMT_NONE;
1347
1348 ASSERT_MGD_MTX(ifmgd);
1349
1350 if (wk)
1351 bssid = wk->bss->cbss.bssid;
1352 else
1353 bssid = ifmgd->associated->cbss.bssid;
1354
1355 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1356
1357 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1358 sdata->dev->name, bssid, reason_code);
1359
1360 if (!wk) {
1361 ieee80211_set_disassoc(sdata, true);
1362 } else {
1363 list_del(&wk->list);
1364 kfree(wk);
1365 }
1366
1367 return RX_MGMT_CFG80211_DEAUTH;
1368 }
1369
1370
1371 static enum rx_mgmt_action __must_check
1372 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1373 struct ieee80211_mgmt *mgmt, size_t len)
1374 {
1375 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1376 u16 reason_code;
1377
1378 if (len < 24 + 2)
1379 return RX_MGMT_NONE;
1380
1381 ASSERT_MGD_MTX(ifmgd);
1382
1383 if (WARN_ON(!ifmgd->associated))
1384 return RX_MGMT_NONE;
1385
1386 if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1387 return RX_MGMT_NONE;
1388
1389 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1390
1391 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1392 sdata->dev->name, mgmt->sa, reason_code);
1393
1394 ieee80211_set_disassoc(sdata, false);
1395 return RX_MGMT_CFG80211_DISASSOC;
1396 }
1397
1398
1399 static enum rx_mgmt_action __must_check
1400 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1401 struct ieee80211_mgd_work *wk,
1402 struct ieee80211_mgmt *mgmt, size_t len,
1403 bool reassoc)
1404 {
1405 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1406 struct ieee80211_local *local = sdata->local;
1407 struct ieee80211_supported_band *sband;
1408 struct sta_info *sta;
1409 u32 rates, basic_rates;
1410 u16 capab_info, status_code, aid;
1411 struct ieee802_11_elems elems;
1412 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1413 u8 *pos;
1414 u32 changed = 0;
1415 int i, j;
1416 bool have_higher_than_11mbit = false, newsta = false;
1417 u16 ap_ht_cap_flags;
1418
1419 /*
1420 * AssocResp and ReassocResp have identical structure, so process both
1421 * of them in this function.
1422 */
1423
1424 if (len < 24 + 6)
1425 return RX_MGMT_NONE;
1426
1427 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1428 return RX_MGMT_NONE;
1429
1430 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1431 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1432 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1433
1434 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1435 "status=%d aid=%d)\n",
1436 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1437 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1438
1439 pos = mgmt->u.assoc_resp.variable;
1440 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1441
1442 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1443 elems.timeout_int && elems.timeout_int_len == 5 &&
1444 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1445 u32 tu, ms;
1446 tu = get_unaligned_le32(elems.timeout_int + 1);
1447 ms = tu * 1024 / 1000;
1448 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1449 "comeback duration %u TU (%u ms)\n",
1450 sdata->dev->name, tu, ms);
1451 wk->timeout = jiffies + msecs_to_jiffies(ms);
1452 if (ms > IEEE80211_ASSOC_TIMEOUT)
1453 run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1454 return RX_MGMT_NONE;
1455 }
1456
1457 if (status_code != WLAN_STATUS_SUCCESS) {
1458 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1459 sdata->dev->name, status_code);
1460 list_del(&wk->list);
1461 kfree(wk);
1462 return RX_MGMT_CFG80211_ASSOC;
1463 }
1464
1465 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1466 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1467 "set\n", sdata->dev->name, aid);
1468 aid &= ~(BIT(15) | BIT(14));
1469
1470 if (!elems.supp_rates) {
1471 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1472 sdata->dev->name);
1473 return RX_MGMT_NONE;
1474 }
1475
1476 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1477 ifmgd->aid = aid;
1478
1479 rcu_read_lock();
1480
1481 /* Add STA entry for the AP */
1482 sta = sta_info_get(local, wk->bss->cbss.bssid);
1483 if (!sta) {
1484 newsta = true;
1485
1486 rcu_read_unlock();
1487
1488 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1489 if (!sta) {
1490 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1491 " the AP\n", sdata->dev->name);
1492 return RX_MGMT_NONE;
1493 }
1494
1495 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1496 WLAN_STA_ASSOC_AP);
1497 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1498 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1499
1500 rcu_read_lock();
1501 }
1502
1503 rates = 0;
1504 basic_rates = 0;
1505 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1506
1507 for (i = 0; i < elems.supp_rates_len; i++) {
1508 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1509 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1510
1511 if (rate > 110)
1512 have_higher_than_11mbit = true;
1513
1514 for (j = 0; j < sband->n_bitrates; j++) {
1515 if (sband->bitrates[j].bitrate == rate) {
1516 rates |= BIT(j);
1517 if (is_basic)
1518 basic_rates |= BIT(j);
1519 break;
1520 }
1521 }
1522 }
1523
1524 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1525 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1526 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1527
1528 if (rate > 110)
1529 have_higher_than_11mbit = true;
1530
1531 for (j = 0; j < sband->n_bitrates; j++) {
1532 if (sband->bitrates[j].bitrate == rate) {
1533 rates |= BIT(j);
1534 if (is_basic)
1535 basic_rates |= BIT(j);
1536 break;
1537 }
1538 }
1539 }
1540
1541 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1542 sdata->vif.bss_conf.basic_rates = basic_rates;
1543
1544 /* cf. IEEE 802.11 9.2.12 */
1545 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1546 have_higher_than_11mbit)
1547 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1548 else
1549 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1550
1551 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1552 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1553 elems.ht_cap_elem, &sta->sta.ht_cap);
1554
1555 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1556
1557 rate_control_rate_init(sta);
1558
1559 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1560 set_sta_flags(sta, WLAN_STA_MFP);
1561
1562 if (elems.wmm_param)
1563 set_sta_flags(sta, WLAN_STA_WME);
1564
1565 if (newsta) {
1566 int err = sta_info_insert(sta);
1567 if (err) {
1568 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1569 " the AP (error %d)\n", sdata->dev->name, err);
1570 rcu_read_unlock();
1571 return RX_MGMT_NONE;
1572 }
1573 }
1574
1575 rcu_read_unlock();
1576
1577 if (elems.wmm_param)
1578 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1579 elems.wmm_param_len);
1580 else
1581 ieee80211_set_wmm_default(sdata);
1582
1583 if (elems.ht_info_elem && elems.wmm_param &&
1584 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1585 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1586 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1587 wk->bss->cbss.bssid,
1588 ap_ht_cap_flags);
1589
1590 /* delete work item -- must be before set_associated for PS */
1591 list_del(&wk->list);
1592
1593 /* set AID and assoc capability,
1594 * ieee80211_set_associated() will tell the driver */
1595 bss_conf->aid = aid;
1596 bss_conf->assoc_capability = capab_info;
1597 /* this will take ownership of wk */
1598 ieee80211_set_associated(sdata, wk, changed);
1599
1600 /*
1601 * Start timer to probe the connection to the AP now.
1602 * Also start the timer that will detect beacon loss.
1603 */
1604 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1605 mod_beacon_timer(sdata);
1606
1607 return RX_MGMT_CFG80211_ASSOC;
1608 }
1609
1610
1611 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1612 struct ieee80211_mgmt *mgmt,
1613 size_t len,
1614 struct ieee80211_rx_status *rx_status,
1615 struct ieee802_11_elems *elems,
1616 bool beacon)
1617 {
1618 struct ieee80211_local *local = sdata->local;
1619 int freq;
1620 struct ieee80211_bss *bss;
1621 struct ieee80211_channel *channel;
1622
1623 if (elems->ds_params && elems->ds_params_len == 1)
1624 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1625 else
1626 freq = rx_status->freq;
1627
1628 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1629
1630 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1631 return;
1632
1633 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1634 channel, beacon);
1635 if (bss)
1636 ieee80211_rx_bss_put(local, bss);
1637
1638 if (!sdata->u.mgd.associated)
1639 return;
1640
1641 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1642 (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1643 ETH_ALEN) == 0)) {
1644 struct ieee80211_channel_sw_ie *sw_elem =
1645 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1646 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1647 }
1648 }
1649
1650
1651 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1652 struct ieee80211_mgd_work *wk,
1653 struct ieee80211_mgmt *mgmt, size_t len,
1654 struct ieee80211_rx_status *rx_status)
1655 {
1656 struct ieee80211_if_managed *ifmgd;
1657 size_t baselen;
1658 struct ieee802_11_elems elems;
1659
1660 ifmgd = &sdata->u.mgd;
1661
1662 ASSERT_MGD_MTX(ifmgd);
1663
1664 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1665 return; /* ignore ProbeResp to foreign address */
1666
1667 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1668 if (baselen > len)
1669 return;
1670
1671 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1672 &elems);
1673
1674 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1675
1676 /* direct probe may be part of the association flow */
1677 if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1678 printk(KERN_DEBUG "%s: direct probe responded\n",
1679 sdata->dev->name);
1680 wk->tries = 0;
1681 wk->state = IEEE80211_MGD_STATE_AUTH;
1682 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1683 }
1684
1685 if (ifmgd->associated &&
1686 memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1687 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1688 IEEE80211_STA_CONNECTION_POLL)) {
1689 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1690 IEEE80211_STA_BEACON_POLL);
1691 mutex_lock(&sdata->local->iflist_mtx);
1692 ieee80211_recalc_ps(sdata->local, -1);
1693 mutex_unlock(&sdata->local->iflist_mtx);
1694 /*
1695 * We've received a probe response, but are not sure whether
1696 * we have or will be receiving any beacons or data, so let's
1697 * schedule the timers again, just in case.
1698 */
1699 mod_beacon_timer(sdata);
1700 mod_timer(&ifmgd->conn_mon_timer,
1701 round_jiffies_up(jiffies +
1702 IEEE80211_CONNECTION_IDLE_TIME));
1703 }
1704 }
1705
1706 /*
1707 * This is the canonical list of information elements we care about,
1708 * the filter code also gives us all changes to the Microsoft OUI
1709 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1710 *
1711 * We implement beacon filtering in software since that means we can
1712 * avoid processing the frame here and in cfg80211, and userspace
1713 * will not be able to tell whether the hardware supports it or not.
1714 *
1715 * XXX: This list needs to be dynamic -- userspace needs to be able to
1716 * add items it requires. It also needs to be able to tell us to
1717 * look out for other vendor IEs.
1718 */
1719 static const u64 care_about_ies =
1720 (1ULL << WLAN_EID_COUNTRY) |
1721 (1ULL << WLAN_EID_ERP_INFO) |
1722 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1723 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1724 (1ULL << WLAN_EID_HT_CAPABILITY) |
1725 (1ULL << WLAN_EID_HT_INFORMATION);
1726
1727 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1728 struct ieee80211_mgmt *mgmt,
1729 size_t len,
1730 struct ieee80211_rx_status *rx_status)
1731 {
1732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1733 size_t baselen;
1734 struct ieee802_11_elems elems;
1735 struct ieee80211_local *local = sdata->local;
1736 u32 changed = 0;
1737 bool erp_valid, directed_tim = false;
1738 u8 erp_value = 0;
1739 u32 ncrc;
1740 u8 *bssid;
1741
1742 ASSERT_MGD_MTX(ifmgd);
1743
1744 /* Process beacon from the current BSS */
1745 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1746 if (baselen > len)
1747 return;
1748
1749 if (rx_status->freq != local->hw.conf.channel->center_freq)
1750 return;
1751
1752 /*
1753 * We might have received a number of frames, among them a
1754 * disassoc frame and a beacon...
1755 */
1756 if (!ifmgd->associated)
1757 return;
1758
1759 bssid = ifmgd->associated->cbss.bssid;
1760
1761 /*
1762 * And in theory even frames from a different AP we were just
1763 * associated to a split-second ago!
1764 */
1765 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1766 return;
1767
1768 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1769 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1770 if (net_ratelimit()) {
1771 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1772 "to a received beacon\n", sdata->dev->name);
1773 }
1774 #endif
1775 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1776 mutex_lock(&local->iflist_mtx);
1777 ieee80211_recalc_ps(local, -1);
1778 mutex_unlock(&local->iflist_mtx);
1779 }
1780
1781 /*
1782 * Push the beacon loss detection into the future since
1783 * we are processing a beacon from the AP just now.
1784 */
1785 mod_beacon_timer(sdata);
1786
1787 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1788 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1789 len - baselen, &elems,
1790 care_about_ies, ncrc);
1791
1792 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1793 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1794 ifmgd->aid);
1795
1796 if (ncrc != ifmgd->beacon_crc) {
1797 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1798 true);
1799
1800 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1801 elems.wmm_param_len);
1802 }
1803
1804 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1805 if (directed_tim) {
1806 if (local->hw.conf.dynamic_ps_timeout > 0) {
1807 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1808 ieee80211_hw_config(local,
1809 IEEE80211_CONF_CHANGE_PS);
1810 ieee80211_send_nullfunc(local, sdata, 0);
1811 } else {
1812 local->pspolling = true;
1813
1814 /*
1815 * Here is assumed that the driver will be
1816 * able to send ps-poll frame and receive a
1817 * response even though power save mode is
1818 * enabled, but some drivers might require
1819 * to disable power save here. This needs
1820 * to be investigated.
1821 */
1822 ieee80211_send_pspoll(local, sdata);
1823 }
1824 }
1825 }
1826
1827 if (ncrc == ifmgd->beacon_crc)
1828 return;
1829 ifmgd->beacon_crc = ncrc;
1830
1831 if (elems.erp_info && elems.erp_info_len >= 1) {
1832 erp_valid = true;
1833 erp_value = elems.erp_info[0];
1834 } else {
1835 erp_valid = false;
1836 }
1837 changed |= ieee80211_handle_bss_capability(sdata,
1838 le16_to_cpu(mgmt->u.beacon.capab_info),
1839 erp_valid, erp_value);
1840
1841
1842 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1843 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1844 struct sta_info *sta;
1845 struct ieee80211_supported_band *sband;
1846 u16 ap_ht_cap_flags;
1847
1848 rcu_read_lock();
1849
1850 sta = sta_info_get(local, bssid);
1851 if (WARN_ON(!sta)) {
1852 rcu_read_unlock();
1853 return;
1854 }
1855
1856 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1857
1858 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1859 elems.ht_cap_elem, &sta->sta.ht_cap);
1860
1861 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1862
1863 rcu_read_unlock();
1864
1865 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1866 bssid, ap_ht_cap_flags);
1867 }
1868
1869 /* Note: country IE parsing is done for us by cfg80211 */
1870 if (elems.country_elem) {
1871 /* TODO: IBSS also needs this */
1872 if (elems.pwr_constr_elem)
1873 ieee80211_handle_pwr_constr(sdata,
1874 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1875 elems.pwr_constr_elem,
1876 elems.pwr_constr_elem_len);
1877 }
1878
1879 ieee80211_bss_info_change_notify(sdata, changed);
1880 }
1881
1882 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1883 struct sk_buff *skb)
1884 {
1885 struct ieee80211_local *local = sdata->local;
1886 struct ieee80211_mgmt *mgmt;
1887 u16 fc;
1888
1889 if (skb->len < 24)
1890 return RX_DROP_MONITOR;
1891
1892 mgmt = (struct ieee80211_mgmt *) skb->data;
1893 fc = le16_to_cpu(mgmt->frame_control);
1894
1895 switch (fc & IEEE80211_FCTL_STYPE) {
1896 case IEEE80211_STYPE_PROBE_REQ:
1897 case IEEE80211_STYPE_PROBE_RESP:
1898 case IEEE80211_STYPE_BEACON:
1899 case IEEE80211_STYPE_AUTH:
1900 case IEEE80211_STYPE_ASSOC_RESP:
1901 case IEEE80211_STYPE_REASSOC_RESP:
1902 case IEEE80211_STYPE_DEAUTH:
1903 case IEEE80211_STYPE_DISASSOC:
1904 case IEEE80211_STYPE_ACTION:
1905 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1906 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1907 return RX_QUEUED;
1908 }
1909
1910 return RX_DROP_MONITOR;
1911 }
1912
1913 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1914 struct sk_buff *skb)
1915 {
1916 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1917 struct ieee80211_rx_status *rx_status;
1918 struct ieee80211_mgmt *mgmt;
1919 struct ieee80211_mgd_work *wk;
1920 enum rx_mgmt_action rma = RX_MGMT_NONE;
1921 u16 fc;
1922
1923 rx_status = (struct ieee80211_rx_status *) skb->cb;
1924 mgmt = (struct ieee80211_mgmt *) skb->data;
1925 fc = le16_to_cpu(mgmt->frame_control);
1926
1927 mutex_lock(&ifmgd->mtx);
1928
1929 if (ifmgd->associated &&
1930 memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1931 ETH_ALEN) == 0) {
1932 switch (fc & IEEE80211_FCTL_STYPE) {
1933 case IEEE80211_STYPE_BEACON:
1934 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1935 rx_status);
1936 break;
1937 case IEEE80211_STYPE_PROBE_RESP:
1938 ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1939 skb->len, rx_status);
1940 break;
1941 case IEEE80211_STYPE_DEAUTH:
1942 rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1943 mgmt, skb->len);
1944 break;
1945 case IEEE80211_STYPE_DISASSOC:
1946 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1947 break;
1948 case IEEE80211_STYPE_ACTION:
1949 /* XXX: differentiate, can only happen for CSA now! */
1950 ieee80211_sta_process_chanswitch(sdata,
1951 &mgmt->u.action.u.chan_switch.sw_elem,
1952 ifmgd->associated);
1953 break;
1954 }
1955 mutex_unlock(&ifmgd->mtx);
1956
1957 switch (rma) {
1958 case RX_MGMT_NONE:
1959 /* no action */
1960 break;
1961 case RX_MGMT_CFG80211_DEAUTH:
1962 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len,
1963 NULL);
1964 break;
1965 case RX_MGMT_CFG80211_DISASSOC:
1966 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len,
1967 NULL);
1968 break;
1969 default:
1970 WARN(1, "unexpected: %d", rma);
1971 }
1972 goto out;
1973 }
1974
1975 list_for_each_entry(wk, &ifmgd->work_list, list) {
1976 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1977 continue;
1978
1979 switch (fc & IEEE80211_FCTL_STYPE) {
1980 case IEEE80211_STYPE_PROBE_RESP:
1981 ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1982 rx_status);
1983 break;
1984 case IEEE80211_STYPE_AUTH:
1985 rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1986 break;
1987 case IEEE80211_STYPE_ASSOC_RESP:
1988 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1989 skb->len, false);
1990 break;
1991 case IEEE80211_STYPE_REASSOC_RESP:
1992 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1993 skb->len, true);
1994 break;
1995 case IEEE80211_STYPE_DEAUTH:
1996 rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
1997 skb->len);
1998 break;
1999 }
2000 /*
2001 * We've processed this frame for that work, so it can't
2002 * belong to another work struct.
2003 * NB: this is also required for correctness because the
2004 * called functions can free 'wk', and for 'rma'!
2005 */
2006 break;
2007 }
2008
2009 mutex_unlock(&ifmgd->mtx);
2010
2011 switch (rma) {
2012 case RX_MGMT_NONE:
2013 /* no action */
2014 break;
2015 case RX_MGMT_CFG80211_AUTH:
2016 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2017 break;
2018 case RX_MGMT_CFG80211_ASSOC:
2019 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2020 break;
2021 case RX_MGMT_CFG80211_DEAUTH:
2022 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, NULL);
2023 break;
2024 default:
2025 WARN(1, "unexpected: %d", rma);
2026 }
2027
2028 out:
2029 kfree_skb(skb);
2030 }
2031
2032 static void ieee80211_sta_timer(unsigned long data)
2033 {
2034 struct ieee80211_sub_if_data *sdata =
2035 (struct ieee80211_sub_if_data *) data;
2036 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2037 struct ieee80211_local *local = sdata->local;
2038
2039 if (local->quiescing) {
2040 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2041 return;
2042 }
2043
2044 ieee80211_queue_work(&local->hw, &ifmgd->work);
2045 }
2046
2047 static void ieee80211_sta_work(struct work_struct *work)
2048 {
2049 struct ieee80211_sub_if_data *sdata =
2050 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2051 struct ieee80211_local *local = sdata->local;
2052 struct ieee80211_if_managed *ifmgd;
2053 struct sk_buff *skb;
2054 struct ieee80211_mgd_work *wk, *tmp;
2055 LIST_HEAD(free_work);
2056 enum rx_mgmt_action rma;
2057 bool anybusy = false;
2058
2059 if (!netif_running(sdata->dev))
2060 return;
2061
2062 if (local->scanning)
2063 return;
2064
2065 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2066 return;
2067
2068 /*
2069 * ieee80211_queue_work() should have picked up most cases,
2070 * here we'll pick the the rest.
2071 */
2072 if (WARN(local->suspended, "STA MLME work scheduled while "
2073 "going to suspend\n"))
2074 return;
2075
2076 ifmgd = &sdata->u.mgd;
2077
2078 /* first process frames to avoid timing out while a frame is pending */
2079 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2080 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2081
2082 /* then process the rest of the work */
2083 mutex_lock(&ifmgd->mtx);
2084
2085 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2086 IEEE80211_STA_CONNECTION_POLL) &&
2087 ifmgd->associated) {
2088 u8 bssid[ETH_ALEN];
2089
2090 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2091 if (time_is_after_jiffies(ifmgd->probe_timeout))
2092 run_again(ifmgd, ifmgd->probe_timeout);
2093
2094 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2095 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2096 printk(KERN_DEBUG "No probe response from AP %pM"
2097 " after %dms, try %d\n", bssid,
2098 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2099 ifmgd->probe_send_count);
2100 #endif
2101 ieee80211_mgd_probe_ap_send(sdata);
2102 } else {
2103 /*
2104 * We actually lost the connection ... or did we?
2105 * Let's make sure!
2106 */
2107 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2108 IEEE80211_STA_BEACON_POLL);
2109 printk(KERN_DEBUG "No probe response from AP %pM"
2110 " after %dms, disconnecting.\n",
2111 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2112 ieee80211_set_disassoc(sdata, true);
2113 mutex_unlock(&ifmgd->mtx);
2114 /*
2115 * must be outside lock due to cfg80211,
2116 * but that's not a problem.
2117 */
2118 ieee80211_send_deauth_disassoc(sdata, bssid,
2119 IEEE80211_STYPE_DEAUTH,
2120 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2121 NULL);
2122 mutex_lock(&ifmgd->mtx);
2123 }
2124 }
2125
2126
2127 ieee80211_recalc_idle(local);
2128
2129 list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2130 if (time_is_after_jiffies(wk->timeout)) {
2131 /*
2132 * This work item isn't supposed to be worked on
2133 * right now, but take care to adjust the timer
2134 * properly.
2135 */
2136 run_again(ifmgd, wk->timeout);
2137 continue;
2138 }
2139
2140 switch (wk->state) {
2141 default:
2142 WARN_ON(1);
2143 /* fall through */
2144 case IEEE80211_MGD_STATE_IDLE:
2145 /* nothing */
2146 rma = RX_MGMT_NONE;
2147 break;
2148 case IEEE80211_MGD_STATE_PROBE:
2149 rma = ieee80211_direct_probe(sdata, wk);
2150 break;
2151 case IEEE80211_MGD_STATE_AUTH:
2152 rma = ieee80211_authenticate(sdata, wk);
2153 break;
2154 case IEEE80211_MGD_STATE_ASSOC:
2155 rma = ieee80211_associate(sdata, wk);
2156 break;
2157 }
2158
2159 switch (rma) {
2160 case RX_MGMT_NONE:
2161 /* no action required */
2162 break;
2163 case RX_MGMT_CFG80211_AUTH_TO:
2164 case RX_MGMT_CFG80211_ASSOC_TO:
2165 list_del(&wk->list);
2166 list_add(&wk->list, &free_work);
2167 wk->tries = rma; /* small abuse but only local */
2168 break;
2169 default:
2170 WARN(1, "unexpected: %d", rma);
2171 }
2172 }
2173
2174 list_for_each_entry(wk, &ifmgd->work_list, list) {
2175 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2176 anybusy = true;
2177 break;
2178 }
2179 }
2180 if (!anybusy &&
2181 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2182 ieee80211_queue_delayed_work(&local->hw,
2183 &local->scan_work,
2184 round_jiffies_relative(0));
2185
2186 mutex_unlock(&ifmgd->mtx);
2187
2188 list_for_each_entry_safe(wk, tmp, &free_work, list) {
2189 switch (wk->tries) {
2190 case RX_MGMT_CFG80211_AUTH_TO:
2191 cfg80211_send_auth_timeout(sdata->dev,
2192 wk->bss->cbss.bssid);
2193 break;
2194 case RX_MGMT_CFG80211_ASSOC_TO:
2195 cfg80211_send_assoc_timeout(sdata->dev,
2196 wk->bss->cbss.bssid);
2197 break;
2198 default:
2199 WARN(1, "unexpected: %d", wk->tries);
2200 }
2201
2202 list_del(&wk->list);
2203 kfree(wk);
2204 }
2205
2206 ieee80211_recalc_idle(local);
2207 }
2208
2209 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2210 {
2211 struct ieee80211_sub_if_data *sdata =
2212 (struct ieee80211_sub_if_data *) data;
2213 struct ieee80211_local *local = sdata->local;
2214
2215 if (local->quiescing)
2216 return;
2217
2218 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2219 }
2220
2221 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2222 {
2223 struct ieee80211_sub_if_data *sdata =
2224 (struct ieee80211_sub_if_data *) data;
2225 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2226 struct ieee80211_local *local = sdata->local;
2227
2228 if (local->quiescing)
2229 return;
2230
2231 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2232 }
2233
2234 static void ieee80211_sta_monitor_work(struct work_struct *work)
2235 {
2236 struct ieee80211_sub_if_data *sdata =
2237 container_of(work, struct ieee80211_sub_if_data,
2238 u.mgd.monitor_work);
2239
2240 ieee80211_mgd_probe_ap(sdata, false);
2241 }
2242
2243 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2244 {
2245 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2246 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2247 IEEE80211_STA_CONNECTION_POLL);
2248
2249 /* let's probe the connection once */
2250 ieee80211_queue_work(&sdata->local->hw,
2251 &sdata->u.mgd.monitor_work);
2252 /* and do all the other regular work too */
2253 ieee80211_queue_work(&sdata->local->hw,
2254 &sdata->u.mgd.work);
2255 }
2256 }
2257
2258 #ifdef CONFIG_PM
2259 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2260 {
2261 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262
2263 /*
2264 * we need to use atomic bitops for the running bits
2265 * only because both timers might fire at the same
2266 * time -- the code here is properly synchronised.
2267 */
2268
2269 cancel_work_sync(&ifmgd->work);
2270 cancel_work_sync(&ifmgd->beacon_loss_work);
2271 if (del_timer_sync(&ifmgd->timer))
2272 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2273
2274 cancel_work_sync(&ifmgd->chswitch_work);
2275 if (del_timer_sync(&ifmgd->chswitch_timer))
2276 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2277
2278 cancel_work_sync(&ifmgd->monitor_work);
2279 /* these will just be re-established on connection */
2280 del_timer_sync(&ifmgd->conn_mon_timer);
2281 del_timer_sync(&ifmgd->bcn_mon_timer);
2282 }
2283
2284 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2285 {
2286 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2287
2288 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2289 add_timer(&ifmgd->timer);
2290 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2291 add_timer(&ifmgd->chswitch_timer);
2292 }
2293 #endif
2294
2295 /* interface setup */
2296 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2297 {
2298 struct ieee80211_if_managed *ifmgd;
2299
2300 ifmgd = &sdata->u.mgd;
2301 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2302 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2303 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2304 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2305 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2306 (unsigned long) sdata);
2307 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2308 (unsigned long) sdata);
2309 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2310 (unsigned long) sdata);
2311 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2312 (unsigned long) sdata);
2313 skb_queue_head_init(&ifmgd->skb_queue);
2314
2315 INIT_LIST_HEAD(&ifmgd->work_list);
2316
2317 ifmgd->capab = WLAN_CAPABILITY_ESS;
2318 ifmgd->flags = 0;
2319 if (sdata->local->hw.queues >= 4)
2320 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2321
2322 mutex_init(&ifmgd->mtx);
2323 }
2324
2325 /* scan finished notification */
2326 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2327 {
2328 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2329
2330 /* Restart STA timers */
2331 rcu_read_lock();
2332 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2333 ieee80211_restart_sta_timer(sdata);
2334 rcu_read_unlock();
2335 }
2336
2337 int ieee80211_max_network_latency(struct notifier_block *nb,
2338 unsigned long data, void *dummy)
2339 {
2340 s32 latency_usec = (s32) data;
2341 struct ieee80211_local *local =
2342 container_of(nb, struct ieee80211_local,
2343 network_latency_notifier);
2344
2345 mutex_lock(&local->iflist_mtx);
2346 ieee80211_recalc_ps(local, latency_usec);
2347 mutex_unlock(&local->iflist_mtx);
2348
2349 return 0;
2350 }
2351
2352 /* config hooks */
2353 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2354 struct cfg80211_auth_request *req)
2355 {
2356 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2357 const u8 *ssid;
2358 struct ieee80211_mgd_work *wk;
2359 u16 auth_alg;
2360
2361 switch (req->auth_type) {
2362 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2363 auth_alg = WLAN_AUTH_OPEN;
2364 break;
2365 case NL80211_AUTHTYPE_SHARED_KEY:
2366 auth_alg = WLAN_AUTH_SHARED_KEY;
2367 break;
2368 case NL80211_AUTHTYPE_FT:
2369 auth_alg = WLAN_AUTH_FT;
2370 break;
2371 case NL80211_AUTHTYPE_NETWORK_EAP:
2372 auth_alg = WLAN_AUTH_LEAP;
2373 break;
2374 default:
2375 return -EOPNOTSUPP;
2376 }
2377
2378 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2379 if (!wk)
2380 return -ENOMEM;
2381
2382 wk->bss = (void *)req->bss;
2383
2384 if (req->ie && req->ie_len) {
2385 memcpy(wk->ie, req->ie, req->ie_len);
2386 wk->ie_len = req->ie_len;
2387 }
2388
2389 if (req->key && req->key_len) {
2390 wk->key_len = req->key_len;
2391 wk->key_idx = req->key_idx;
2392 memcpy(wk->key, req->key, req->key_len);
2393 }
2394
2395 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2396 memcpy(wk->ssid, ssid + 2, ssid[1]);
2397 wk->ssid_len = ssid[1];
2398
2399 wk->state = IEEE80211_MGD_STATE_PROBE;
2400 wk->auth_alg = auth_alg;
2401 wk->timeout = jiffies; /* run right away */
2402
2403 /*
2404 * XXX: if still associated need to tell AP that we're going
2405 * to sleep and then change channel etc.
2406 */
2407 sdata->local->oper_channel = req->bss->channel;
2408 ieee80211_hw_config(sdata->local, 0);
2409
2410 mutex_lock(&ifmgd->mtx);
2411 list_add(&wk->list, &sdata->u.mgd.work_list);
2412 mutex_unlock(&ifmgd->mtx);
2413
2414 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2415 return 0;
2416 }
2417
2418 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2419 struct cfg80211_assoc_request *req)
2420 {
2421 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2422 struct ieee80211_mgd_work *wk, *found = NULL;
2423 int i, err;
2424
2425 mutex_lock(&ifmgd->mtx);
2426
2427 list_for_each_entry(wk, &ifmgd->work_list, list) {
2428 if (&wk->bss->cbss == req->bss &&
2429 wk->state == IEEE80211_MGD_STATE_IDLE) {
2430 found = wk;
2431 break;
2432 }
2433 }
2434
2435 if (!found) {
2436 err = -ENOLINK;
2437 goto out;
2438 }
2439
2440 list_del(&found->list);
2441
2442 wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2443 if (!wk) {
2444 list_add(&found->list, &ifmgd->work_list);
2445 err = -ENOMEM;
2446 goto out;
2447 }
2448
2449 list_add(&wk->list, &ifmgd->work_list);
2450
2451 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2452
2453 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2454 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2455 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2456 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2457 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2458
2459 sdata->local->oper_channel = req->bss->channel;
2460 ieee80211_hw_config(sdata->local, 0);
2461
2462 if (req->ie && req->ie_len) {
2463 memcpy(wk->ie, req->ie, req->ie_len);
2464 wk->ie_len = req->ie_len;
2465 } else
2466 wk->ie_len = 0;
2467
2468 if (req->prev_bssid)
2469 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2470
2471 wk->state = IEEE80211_MGD_STATE_ASSOC;
2472 wk->tries = 0;
2473 wk->timeout = jiffies; /* run right away */
2474
2475 if (req->use_mfp) {
2476 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2477 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2478 } else {
2479 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2480 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2481 }
2482
2483 if (req->crypto.control_port)
2484 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2485 else
2486 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2487
2488 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2489
2490 err = 0;
2491
2492 out:
2493 mutex_unlock(&ifmgd->mtx);
2494 return err;
2495 }
2496
2497 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2498 struct cfg80211_deauth_request *req,
2499 void *cookie)
2500 {
2501 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2502 struct ieee80211_mgd_work *wk;
2503 const u8 *bssid = NULL;
2504
2505 mutex_lock(&ifmgd->mtx);
2506
2507 if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2508 bssid = req->bss->bssid;
2509 ieee80211_set_disassoc(sdata, true);
2510 } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2511 if (&wk->bss->cbss == req->bss) {
2512 bssid = req->bss->bssid;
2513 list_del(&wk->list);
2514 kfree(wk);
2515 break;
2516 }
2517 }
2518
2519 /*
2520 * cfg80211 should catch this ... but it's racy since
2521 * we can receive a deauth frame, process it, hand it
2522 * to cfg80211 while that's in a locked section already
2523 * trying to tell us that the user wants to disconnect.
2524 */
2525 if (!bssid) {
2526 mutex_unlock(&ifmgd->mtx);
2527 return -ENOLINK;
2528 }
2529
2530 mutex_unlock(&ifmgd->mtx);
2531
2532 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2533 sdata->dev->name, bssid, req->reason_code);
2534
2535 ieee80211_send_deauth_disassoc(sdata, bssid,
2536 IEEE80211_STYPE_DEAUTH, req->reason_code,
2537 cookie);
2538
2539 return 0;
2540 }
2541
2542 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2543 struct cfg80211_disassoc_request *req,
2544 void *cookie)
2545 {
2546 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2547
2548 mutex_lock(&ifmgd->mtx);
2549
2550 /*
2551 * cfg80211 should catch this ... but it's racy since
2552 * we can receive a disassoc frame, process it, hand it
2553 * to cfg80211 while that's in a locked section already
2554 * trying to tell us that the user wants to disconnect.
2555 */
2556 if (&ifmgd->associated->cbss != req->bss) {
2557 mutex_unlock(&ifmgd->mtx);
2558 return -ENOLINK;
2559 }
2560
2561 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2562 sdata->dev->name, req->bss->bssid, req->reason_code);
2563
2564 ieee80211_set_disassoc(sdata, false);
2565
2566 mutex_unlock(&ifmgd->mtx);
2567
2568 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2569 IEEE80211_STYPE_DISASSOC, req->reason_code,
2570 cookie);
2571 return 0;
2572 }
kernel-based virtual machine